Solenoid dipper trip



Aug. 25, v1931. E. TEL-LIER ET AL 1,820,546

l SOLENOID' DIPF-ER TRIP F'ile-d Aug. 5, 1929 f Mmmm' m v abkozmqa 85the excavating machine.

Patented Aug. 25, 1931 UNITED ls'rpfrss PATENT OFFICE EDGAR H. TELLIEEAND EOBEET o. DECKMAN, or MILWAUKEE, wisooNsiNAssiGNoEs y To KOEHEINGCOMPANY, OE MILwAUxEE,wisoONsIN, A CORPORATIONy SOLENOID DIPPEE TEirApplication :ned August-5,

Power means fortripping the doorof a dipper in an excavating machine hasbeen used for a considerabley vperiod of years. However, severalldifficulties have-arisen inV this connection.

It is understood by those skilled in the art that the dipper andassociated clipperl stick are continually changing 4their position kinrespect to theboom of an excavating machine. If the power means islocated on the boom of the machine, it is necessary to devise some typeof iexible'power transmission from the power meansnto the latchingmechanism of the door in `order to accommodate this change of positionof the dipper in respect to the boom. means is mounted on the kClipperstick, it is necessary to provide a flexiblemotive force for this power`means since the source of power in practically every case is located onthe body of the excavating machine. The object of our invention,therefore, is to provide novel mechanism for transmitting power to apower means on the dipper stick which mechanism will adapt itself to thevvarying positions of the dipper stick ywith respect to the boom.

In the instant construction or `embodiment of our invention we make useof an electrical clipper tripping mechanisinpniounted on the dipperstick.v ing energy to this electric dipper trip is woun on a reel whichis in Vturn actuated by the racking in and crowdingy out mechanism ofconstruction the cable is wound and funwound as the Vdipper is racked inand crowded out, thereby providing for flexibility in the powertransmission means. Novel devices for supplying an .electrical currentto this cable are also provided. Y

A further obj ect of the invention is the provision of a tensioningmeans independent and n separate from the aforesaid reel by means of `45which the cable is kept taut at all times.

Anotherobfect of the invention is the provision of a novel linkagebetween the electrical devices and the dipper latching mech-- anism. Thelinks are so constructed or assembled that lthe initial movement thereofisy :come apparent vas Likewise, if the power h y Y s ,an excavatingmachine with which my novel l.construction thereof. f

of Figure the reel with the Vracking in and crowding out The cable forsupplyn d understood that we are not to be limited to Because of thisvwith the usual dipper stickB, dipper C hav-- 11929. serial No. 383,504.

unrestricted, therebyl lallowing the ypower ymeans to gather a certainamount of` velocity or momentum, which, upon further lInovementfofsaidvpower means isV given up indelivering a quick snatcliing'action to thelatching mechanism. This insureSla more positive and more ecientoperation of the latching mechanism.

Further objects of our invention will bethe description thereofpro nceeds.

lor a full and more completeunderstanding thereof, reference may be hadto the following description and accompanying drawings, in which-f. Y

Aligurel 1s a side view` of those .parts of inventionis `associated andshows the saine applied thereto.

lupon which my'c'able is wound and has parts broken away to more clearlybring out the Figure 3 is a view taken about on the line l and shows theassociation of mechanism, and y n `Figure t 1s a perspective view of amodi fied formA of reel construction.

.Vl/Vhile a preferred specific embodiment of.y 80 lour invention isherein set forth, it is to be the exact constructions illustrated anddescribed, because" various details of these constructions mayl bemodified within theV purview of thev appended claims. sReferringparticularly to Figure l, a portion of the boom of anexcavating machine is represented at A which boom is provided ing a doorD, and any suitable type of latching fmechanism therefor, not shown. Theshipper shaft of the racking in and crowding out mechanism is shown.at,E.f

Asolenoid 1 comprising a coil 2 and armature '3 isl secured to thedipper stick B by any suitable means such as the brackets 4. The ends ofthe coil 2 are` formed with connecting terminals denoted 5 and 6. Oneend of an operating member 100 7 is pivotally connected at 8 to bracket9 which in turn is secured to the dipper stick B. The other end of thisoperating member 7 is connected to that end of the armature 3 whichextends beyond the coil 2 by means of a link 10. A second link 11 ispivotally secured to the operating member 7 at any suitable pointbetween the ends thereof and denoted 12. A chain 13 loosely connects thelink 11 to the latching mechanism. It will readily be understood,therefor, that movement of the armature 3 in the coil 2 is free andunrestricted at the initiation of such movement. The armature 3' willtherefore develop a high velocity and momentum. Upon further andcontinued movement of this armature 3 the chain 13 will become taut andthis aforementioned velocity and momentum will thereupon be delivered tothe unlatching mechanism with a quick snatching action, thereby insuringpositive and efficient operation thereof.

The manner in which electrical energy is supplied to the coil 2 of thesolenoid 1 will now be described. The terminal 6 of the coil 2 isgrounded to the dipper stick at any convenient point such as 14. A cable15 having one end secured to the terminal 5 is threaded through the eye16 of an elastic insulating member 17, preferably made of rubber, theother end of which is secured to the dipper stick B by means of abracket 18. The cable l5 is then brought up to a reel 19 which in turnis secured to the shipper sha-ft E. In the preferred form the reel 19has secured thereto a ring 20 made of any suitable material for properlyconducting an electrical current. This ring 20 is insulated from thereel 19 by insulation material 29, ring 20 serving as a currentcollector, the insulation 29 preventing How of current through the reel19. The cable 15 is wound about the reel 19 a suitable number of timesand the end of said cable is passed through openings 21 in the reel 19and then secured to the ring 20 as at 22. Another cable 23 has one endsuitably connected to a power source not shown, the other end beingconnected to a brush 24 which is positioned to engage and Contact thering 20. The other connection of the power source is grounded as will bereadily understood. It can thus be seen that the solenoid is energizedfrom a power source located on the body of the excavating machine bymea-ns of a cable which is wound and unwound as the dipper stick isracked in and crowded out.

The tensioning means 17 is provided so that the cable 15 will be taut atall times, even if the same should become stretched or deformedduringoperation of the machine.

As before pointed out, this member 17 is preferably made of aninsulating material such as rubber to guard against any possibility of ashort circuit.

In Figure 4 a modified form of reel has been shown. In this constructionthe cable 15 is wound about a reel 25, the end of the cable 15 beingdirectly secured thereto as shown a-t 26. A bushing 27 of any suitableinsulating material is interposed between the reel 25 and the shippershaft E, thereby insulating these parts one from another. The bushing 27may be provided with projections or lugs 28 so as to form a positiveconnection with the reel 25. In this construction it is unnecessary toinsulate the cable 15, and brush 24 may bear directly against the reel25, thereby eliminating the necessity of the ring 2() as abovedescribed.

Having thus described our invention, what we claim as'new and desire tosecure by Letters Patent of the United States, is-

1. In dipper tripping mechanism for eX- cavating apparatus, thecombination with a dipper having a door latching mechanism, andshiftable supporting means therefor, oi' an electric actuating unit forsaid latchiiig mechanism and carried by said supporting means, anelectric conductor connected one end to a suitable source of currentsupply and at the other end to said unit, and elastic, insulating siacktake up means cooperating with said conductor to maintain slack take upof the saine during shifting of the supporting means.

2. In dipper tripping mechanism for eX- cavating apparatus, thecombination with a dipper having a door, latching mechanism therefor,and a support for the dipper, of

an electric actuating unit for said latching mechanism, an electricconductor cable coniiected at one end to said unit and at the other endto a suitable source oi" current,

devices for shifting the dipper in respect toV the support, insulatedwinding means for reeling the conductor cable and controlled by saiddevices and a yieldable insulating slack take up means, both of saidmeans coacting with said conductor cable to maintain' the same in a tautcondition.

3. In dipper tripping mechanism for an excavator, the combination with aboom, a dipper stick, a dipper having a door, latching mechanismtherefor, and means includ-F5115 ing a shipper shaft for racking iii andcrowding out the dipper stick, of an electrical operating means on thedipper stick for operating said latching mechanism, a cable connected tosaid electrical operating means for( supplying electrical energythereto, means carried by the shipper shaft for winding and unwindingsaid cable as the dipper stick is racked in and crowded out, the saidmeans being provided with insulation to prevent' flow of currenttherethrough and a resilient member of insulating material separate fromsaid last named means for tensioning said cable.

4. In dipper tripping mechanism for anl lll!) excavator, the combinationwith a dipper having a door, latching mechanism therefor, and a supportfor the dipper, of a solenoid for actuating the latching mechanism,means comprising a current conducting cable for supplying electricalpower tosaid solenoid, a slack connecting means connecting said unit tosaid latchingcmechanism whereby initial movement of said unit isunrestricted to allow the same to accumulate momentum for delivering aquick snatching action to the latching mechanism, and an elasticinsulating member for maintaining the` said cable taut under al1conditions of operation.

5. Dipper trip mechanism comprising a y dipper stick, a dipperfhaving adoor, latching mechanism therefor, a solenoid including an armature, amember pivoted to the dipper stick and connected'to the armature of-thesolenoid, a slack operating means connecting said member to the latchingmechanism, and means comprising a current conducting cable forenergizing the solenoid` to cause move-v ment of the armature, andelectrically insulated means for maintaining the said cable taut underall conditions of operation.

6. ln a shovel, a boom, a clipper stick, a dipper having a door,latching mechanism therefor, an electrical device carried by the dippcrstick, means operatively connecting said device to the latchingmechanism, means for racking in and crowding out theV boom, a reeloperated by said last named means,

means for electrically energizing said device includinga ring carried bysaid reel, a brush contacting with said ring, a conducting cable havingone end electrically connected to thek solenoid and the other end woundabout said reel and secured to said ring,a second cable connected to thesaid brush and to a source of current for conducting the current fromthe said source to the cable leading to the solenoid, and a rubbermember secured to the dipper stick and to thesaid cable leading to thesolenoid for maintaining the said cable taut under all conditions.

In testimony whereof we afiiX our signatures.

EDGAR H. TELLIER. ROBERT C. DECKMAN.

